[s-cars] ?? for List Physicists

[jeff posto]

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[ Picked text/plain from multipart/alternative ]
Bill,

On the right side of my brain (artistic) I want to believe that review.. Bu=
t the left side of my logical mind does not. I think we need a guinea pig t=
o test it in real life. and a cash pool to bet on it, proceeds to pay for t=
he unit.

I mean, you read that review and it's really convincing, including the fina=
l 'road test'.

I find it hard to believe the Lidatek device can synchornize to an incoming=
 laser pulse accurately and reliably enough to be dependable.
They don't talk about how many Lidatek misses were encountered.

It has to retransmit a pulse that is distance varied to fool the Laser spee=
d gun. This is a classic signals and systems problem where you have two sys=
tems operating at differing 'clock' frequencies and you must synchronize th=
em first  in order to exchange data.

Serial Digital audio, digital video, DBS satellite all have to solve this p=
roblem. This solution is well known and the electronics take time to conver=
ge on an accurate and repeatable level of stability. If the signal is lost,=
 retransmission usually recovers the synch.
Commonly done with the phase locked loop. Many versions analog and digital =
preside.

In these systems, the fault mode is the data is not received in one directi=
on.   In entertainment systems, you get noise or a blank picture.
In Laser detection systems you get a ticket.

Translation: What's the error rate?

If the Lidatek does not receive AND synch on the incoming laser from the tr=
ansmitter, then no return pulse is generated. At that same time, if the Las=
er gun actually does receive it's return pulse, you're tagged, ticketed.

Sure when it works, I don't doubt the display of the Laser is unclear and t=
he officer retransmits. But that's not enough to convince me to drop $400 c=
lams.
Jeff Posto





Bruce Mendel <brucem105 at comcast.net> wrote:
There's only two that work, in my humble opinion:

1=2E Blinder MT-10 (80% or so effective)

2=2E Escort ZR3 (90%+ effective)

I have tested the ZR3 with a friend that's a trooper in NJ, and it works.
The only thing is, they make the laser unit go nuts and can show it's being
jammed, so you have to haul the speed down, then turn it off so when the get
shot by the laser again, they get a speed reading.

Bruce
----- Original Message -----
From: "Bill Mahoney"
To: "'s-car-list'"
Sent: Thursday, May 15, 2003 10:58 AM
Subject: [s-cars] ?? for List Physicists


> Yet again, I am too ignorant to figure out if this is just marketing
> hype or may actually work?
> http://www.audiworld.com/news/03/lidatek/
> This pertains to a $350 / $450 supposed lidar jammer.
> http://www.lidatek.com/
>
> I do know that tickets are mostly being in the wrong place at the wrong
> time, but spending $400 to $900 is easily saved in time and one year's
> insurance premiums.
> The Secretary of State has recently sent me a 4 year safe drivers award
> (which I have displayed next to my track picture:) and I'd like to keep
> that going ..yes.
> Cheers'
> Bill m -Rainman "excellent driver;)"
>
>
>
>
> _______________________________________________
> S-CAR-List mailing list
> S-CAR-List at audifans.com
> http://www.audifans.com/mailman/listinfo/s-car-list

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